Concrete form



W. J. PEDERSEN.

CONCRETE FORM.

APPLICATION FILED SEPT. 20,1920.

1,407,5 9, Patented Feb. 21, 1922.

5 4 i'y Jr IIVVE/VTOR WITNESSES WALnEMARuuAq/s HEDERSEN J6? BY WW1 M I) TTORNEYS ar as 'WALDEMAR' Juries run-Ensure, or rrortar. PARK, NEW YORK,

1 coucnnrr. FORM.

Application m afse tembei-eo, 192p. Serial no. a ts-54.

Todllwhomit may concern Be it knownfthat 'Lj WVALDEMAR Jumus Promise}, a citizen of theUnited- States; and

a resident of Floral Parkfiii t-he county of Nassau and State of New York, have invent I ednew and Improved-Concrete Form, of

Z, in making building columnsl' I which the followingis a full, clear, and exact description. f i p v v This invention relates to concrete forms.

and has particular "reference to forms used:

An 'ob'ect ot the invention concernsthe provision of a concrete form ormold so constructetlthat' columns may be sin iply and quickly formed with a minimum eirpendt tureof time'and labor on the part of the workmen.

' Another object resides in the provision of means whereby the necessity for long 63113911 ence or skill on-the part of the laborer is not required to build columns using this invention. v

'A further object of the invention resides in the provision of means whereby afterthe columns are formed they may be readily removed from the form or moldwithout impairing their surfaces.

A still further object resides in the pro; vision of the particular construction and arrangement of parts as will be hereinafter def scribed and claimed and shown in theaccom panyi'ng drawings. 1

In the art which concerns the manufacture of building material, such asposts or columns, from concrete, cement, plaster, or other similar material, it has generally been necessary for the workmen performing these operations to have considerable experience and great skill in thejmanufacture of such structures. Moreover, the forms previously used required the expenditure otconsiderable time and labor in their assembly and manipulation. In order to overcome these disadvantages in the usecof forms jf OI making concrete structures, I haveQprO ided at simple form for manufacturing. posts and columns which, briefly and in general terms, comprises an upper and a. lower forinl ead which maybe adjustably connectedtogether. These headsa're provided with =.su itable.jprojections on adjacent faces adapted toreceive' inner and outer mold formswhich are made of resilient material and between which inner and, outer forms thematerial of which the column is to be built is poured. Re: enforcing material, such as"rods' or wire I mesh, may inserted within the mold in a very simple and ready manner. Means are respect toth'eup'per and lower headsabove mentioned. Furthermore, one of theheadsis provided with means whereby the material maybe poured therethrough.

Further features and advantages of the device will, be apparent from the descrip tion and claims taken in connection with the drawings. The invention is illustrated inthe drawin fs', of which 7 c Figure l is a vertical longitudinal section through the form orinold; it

Figure 2; isa plan View of the form;

Figure 3 is a. horizontal transverse section taken onthe line33-of Figure 1; and

' Figure 4 is an elevation part-1y in section showing the completed column or post.

As shown'in the drawings, the form or mold comprises a lower head portion 1 and anupper head portion 2, which are adapted, as shown, to be connected together by means of a bolt or rod 3 having an adjustable nut ton a threaded nut portion 5 thereof. The

inner facet of head portion 1 is provided witha raised annular portion 7 which forms onyits outer face a"circular flange 8. A tapered plug 9 :pr0jectsinwardly from the central portion-of the face 6 of the head portionxl. Adjacent the base of this tapered plug a groove 10 is formed between the base of the plug 9 and the inner edge of the raised annular portion 7. In an ex.- actly similar manner the head portion 2 is provided-witha taperedplug member 11, a flange 12, and a. grooved portion 13 on its inner face 14. The head portions 1 and 2 aredisposed with faces 6 and 7 adjacent each other.

A sheetvof flexible-material 15, such as sheet tin copper or other suitable substance, is adapted to extend between the inner faces (i and of the head portions. 1, and 2 and to surround and bearagainst the flange port tions 8. and 12, respectively, of the head portions 1 and 2. .Thissheet 15 forms the outer member ofthe mold proper. A sim- 1,

face of the upper head portion 2 in 'a plura-lity of places around the plug portion 18 is pierced by apertures such as 19, shown in Figure 2, through which the cementitious material is poured into the mold space between sheets 15 and 16.

Vith respect to the curved portions 10 and 13, it will be noticed that the tapers of-the plug members 9 and 11 are so formed asto gradually increase in diameter until the lower portion of the tapers adjacent the above-mentioned grooves are substantially of the same diameter as the grooves them selves. This particular formation is for a purpose which will be hereinafter apparent V in considering the operation of the device.

In the operation of this device, in forming columns or posts, the lower head portion 1 is placed on any suitable support with the bolt or rod 3 projecting upwardly therethrough. The inner sheet of flexible ma terial 16 is then rolled into a cylindrical shape having a diameterin size intermediate the diameter of the groove 10 and the diameter of the outer tapered end of the plug 9. This curved end of the sheet 16 is then placed over the tapered plug 9 and slowly forced downward along the taper, whereby the effect/of this taper is to gradually expand the sheet 16 into the proper diameter, and by thus forcing the sheet 16' downwardly it is gradually and easily introduced into the groove 10. The tapered plug 9, therefore, forms a simple and positive means whereby a curved edge of the sheet can'be readily introduced into the groove.- It will be apparent to any one familiar with this sort of device that it is a very difficult matter to insert the edge of a sheet of flexible material into a groove which is circular in form.

Having inserted the lower end of the sheet 16-into the groove 10, the upper head portion 2 is placed on the upper end of bolt or rod 3 and the .upper edge of 'the sheet 16 is similarly inserted in the groove 13.

The nut 4 .is then threaded on to the bolt 3 to tighten the union between the head portions and. the sheet16. The sheet of re-enforcing material 17, which is .of wire mesh Or other suitable .niateriahl is then placed around thesheet 16 and spaced therefrom the desired distance.

a This sheet 17 rests upon the top surface of the raised annular portion 7. v The outer sheet 15 is then rolled tightly around the fiangdportions 8 and threaded and adapted to receive a nut 22.

The outer end of this lever 21 is adapted to swing into a slotted portion inthe other end of the band 20.and to be tightened therein by the operation of the nut 22. V'The' mold is nowwin condition to receive'fthe cementitious material, which is thereupon poured into themold through the apertures 19 in the head portion 2 above mentioned.

After the cementitious material has set de' sired period of time, the moldlcan be dismantled in a very simple manner.

By unscrewing the'nut 22, the levei 2l' can be swung back,thus releasing'the band.

20 of the outer sheet 15. The sheet 15 being of flexible andsemi-resilient material, and having been tightly rolled intoposition, at;

this time tends to open up or expandlikea springyand this action, which is sim'llar to the action of one plate sliding on another,

causes the sheet 15 to move away from the outer surface of the cementitious material Without causing any particular damage thereto. The nut 41 is then unscrewed and the heads 1 and 2 are removed; To remove the inner sheet 16, one end of the 'upperedg'e is gripped and moved in a direction parallel to itself, as in Winding a spring. This re-;

sults in decreasing the diameter of the sheet 15 and removes the surface-of the sheet from the inner face of the cementitious material by a sliding action similartothe one above mentioned. This also results in the removal of the sheet from the cementitious surface with substantially no damage to the surface thereof. 1 i

It is readily perceived, therefore, that my device is capable of simple and ready assem bly and can be readily and easily dismantled and in such manner as .to result in no dis? figuration of the surface of the cementitious material. The flexible sheets can be formed,

and inserted into place with a maximum of ease, and the whole operation can beperQ, formed by one not necessarily having any great experienceor highdegree ofskill in.

this particular line of work;

It is understood, of course, that .thev di-j mensions of the head portions 1and}2 a nd the d menslons ofthe flanges and grofoyes thereon, which have been above mentioned,

can be varied tosuit the desired'dimensions of the post or column which is to be made by means of this device; 7 a i i What I claim is 1. A concrete form comprisingaheiad por-.

tion having a groove therein, a sheet of flex; iblematerial, and means on said headportion to guide the edge of the sheet into the groove.

2. A concrete form comprising a head portion-having a groove therein, a sheet of flexible material, and means on said head por tion adjacent the groove to guide the edge of the sheet into the groove.

3. A concrete form comprising a head p01 tion having a groove therein, a sheet of flexible material, a tapered plug on said head portion adjacent the groove to guide the edges of the sheet into the groove.

4. A concrete form comprising ahead portion having a circular groove therein, a sheet of flexible material adapted to be rolled into the form of a cylinder, and a tapered plug on said head portion adjacent and within the groove to guide the edge of the sheet into the groove. r

5. A concrete form comprising two head portions, a curved sheet of flexible material extending therebetween, and means on said head portions and integral therewith to engage said sheet and hold it in position.

6. A concrete form'comprising two head portions, a cylindrical sheet of flexible material extending therebetween, and means on said head portions and integral therewith to engage said sheet and retain it in position.

7. A concrete form comprising two head portions having grooves therein, a cylindrical sheet of flexible material extending there between, and means extending betweenthe head portions to hold them rigidly in position.

8. A concrete form comprising two head portions having circular grooves therein, a

cylindrical sheet of flexible material extending therebetween, and a tapered plug on each of said head portions and dlsposed with1n said grooves to engage the edges of the cylindrical sheet and guide them into the grooves.

9. A device comprising a surfacehaving 10. A device comprising a surface having a closed circulargroove therein, a tapered plug on said surface within and adjacent said groove and adapted to guide the edges of a sheet of material into said groove.

11. A concrete form comprising a plurality of head portions having grooves therein, a cylindrical sheetof flexible material engaging the groove along its edges, an annular flange in each of said head portions of greater diameter than the groove, a second sheet of flexible material embracing and bearing against the outer edge of said flanges at its opposite ends, and means embracing the sheet to hold it against the flanges.

12. A concrete form comprising a plurality of head portions having circular grooves therein, a cylindrical sheet engaging along its opposite edges with said grooves, means on each of said head portions adapted to guide the edges of said sheet into the grooves, an annular flange on said head portions, said flanges being of greater diameter than the grooves, a second sheet of flexible material extending between the head portions and bearing against the outer edge of each flange at its opposite edges, and fastening means embracing said second sheet of flexible material to hold itagainst the flanges.

13. A concrete form comprising a 'pluralible material to hold it against the flanges,

and means extending between said head portions to retain them rigidly with respect to the flexible sheets.

WALDEMAR JULIUS PEDERSEN. 

